How to deal with common faults in industrial refrigeration units?

1. Compressor failure.

1.The compressor motor does not start or stops immediately after starting.

This condition is usually related to a power supply problem, a power supply line problem, an internal problem in the motor, or a faulty pressure switch. Check that the power supply and wiring are normal, and then check the motor for internal faults, such as bearings and windings. If all of this is fine, it may be a faulty pressure switch.

2.The compressor motor can be started, but it produces abnormal noise when running.

This can be due to a faulty bearing, a lack of lubricating oil, a failed intake or exhaust valve, etc. Replace the faulty parts and replenish the lubricating oil.

3.The compressor motor is functioning normally, but the refrigeration is not good.

It can be caused by problems such as too high or too low pressure, overheating of the condenser, or freezing of the evaporator. Check the condenser and evaporator first, then the compressor pressure. If these are all right, it may be due to a refrigerant leak that needs to be vented and recharged.

Second, the evaporator failure.

1.The evaporator freezes.

Once the evaporator freezes, the refrigeration effect will be significantly reduced or even stop working. The reason may be due to the inlet air temperature being too low, the refrigerant is insufficient, or the evaporator dust is clogged, etc. Check whether the inlet air temperature is normal, check whether the refrigerant is sufficient, and clean the evaporator.

2.The evaporator is not refrigerated.

This is usually caused by an evaporator temperature that is too high, a lack of refrigerant, or a leak in the circulating system. Check whether the evaporator temperature is too high, check whether the refrigerant is sufficient, check the leakage of the circulation system and repair it.

3. Condenser failure.

1.The condenser is overheating.

If the condenser is overheated, it may cause the refrigeration unit to not work properly, which may be caused by problems such as high inlet temperatures, poor ventilation, and clogged water pumps. Confirm whether the inlet air temperature is normal, check whether the dust needs to be cleaned, and check whether the water pump is working properly.

2.Condenser leakage.

If there is a condenser leak, the refrigerant in the system may leak out of the leak and cause the pressure to drop, which can affect the refrigeration effect. Identify the leak location and repair the leak.

To sum up, refrigeration units often suffer from problems such as compressor failure, evaporator failure, and condenser failure. For different types of faults, appropriate maintenance methods need to be used to solve them. Regular maintenance and inspections during system operation can reduce the occurrence of failures.

Common faults and troubleshooting methods of industrial refrigeration units.

One. Turn on the power switch, the chiller power indicator is not on.

1. If the fuse is not installed, install the appropriate fuse.

2. If the power indicator is damaged, replace the electronic board.

3. The three-phase wiring of the power supply is wrong (pay attention to the auxiliary control line), two. Check the wiring problem Turn on the power switch and the water pump switch to burn the fuse.

1. Check the circuit short circuit fault control wire and main power line.

2. The rotor of the water pump is stuck, and the rotor of the motor is loosened with a screwdriver (suitable for chillers below 5 horses).

Three. Pump failure.

1. The motor coil of the water pump is short, the circuit is broken, the motor coil is repaired or the motor is replaced.

2. The overload protector of the water pump will automatically jump open, and the current limit of the protector will be appropriately adjusted up within the allowable range, and the reset button will be pressed halfway.

Four. Compressor failure.

1. The compressor coil is short, the circuit is broken, and the matching compressor is replaced.

2. The compressor overload protector will automatically jump off, adjust the current limit of the protector appropriately within the allowable range and press the reset button.

Five. Compressor frosting.

1. If the circulating water flows or the valve is not opened, check the water valve, all pipelines to ensure that they are unblocked, and install short-circuit pipelines.

2. The configuration of the circulating water pipeline is too small, and the diameter of the circulating water pipe should be increased to ensure the normal water circulation.

Six. The temperature is displayed according to the temperature of the meter, and the number jumps up and down.

1. The temperature control meter is damaged, and the temperature control meter is repaired or replaced.

2. If the contact of the temperature sensing line is poor, repair or replace the temperature sensing line.

3. If the temperature sensor line and temperature measuring body are dirty, wipe the temperature measuring body clean.

Seven. Freezing in the circulating water tank.

1. The set temperature is too low to correct the set value.

2. There is no circulating water in the water tank, and a circulating water channel is shorted between the chilled water outlet and the inlet.

3. If the temperature control meter is out of control, replace the temperature control meter.

Eight. High voltage faults.

Poor heat dissipation, the radiator is too dirty, the cleaning radiator can not be windy, improve the ventilation conditions The cooling fan is not working, check whether the fan motor is burned out and short-circuited to repair or replace the motor motor. If the high-voltage engine is damaged, replace the high-voltage engine.

Nine. Poor refrigeration.

If the refrigerant is insufficient or the pipeline leaks, the refrigerant should be supplemented or repaired after leak detection, and the refrigerant should be replenished after vacuuming.

Ten. Poor heat dissipation.

If the radiator is too dirty, the radiator valve is not opened or is too small, clean the radiator and open the valve widely.

There are many common faults in industrial refrigeration units, and the following are some common faults and corresponding solutions:

The refrigeration unit does not start.

Solution: Check whether the power supply, fuse, relay, and motor are damaged or faulty; Check that the controller is suitable and damaged; Check to see if the compressor's overload protection is triggered.

The refrigeration unit cannot be refrigerated or the refrigeration effect is poor.

Solution: Check whether the condenser and evaporator are contaminated or overheated; Check to see if the refrigerant is leaking or insufficient; Check that the diffusion valve, evaporator, and condenser are circulating properly.

The refrigeration unit is noisy.

Solution: Check whether the motor bearing is worn or malfunctioning; Check whether the refrigeration unit is installed securely and if there are resonance issues.

The refrigeration unit has a short running time and automatically stops or restarts.

Solution: Check whether there is leakage problem in the refrigeration system; Inspect pressure sensors, temperature sensors, and electrical control boards for faults or damage.

The condenser of the refrigeration unit has a poor condensation effect.

Solution: Check whether the cleaning of the refrigeration system is timely; Check whether the exhaust fan is faulty or damaged; Check whether the heat dissipation status of the condenser is normal.

The above are some common faults and solutions, but if none of the above methods can solve the problem, it is recommended to contact professional industrial refrigeration unit maintenance personnel for inspection and maintenance in time.

You can understand the industrial chiller with temperature control in Zhongneng and the quality is guaranteed!

Chongqing Chuanlong cold storage installation for everyone to sort out the common faults of the air cooler and the summary of how to deal with the fault!

Cold storage failure (1).

Fault phenomenon: insufficient air volume and air pressure.

Cause of failure: 1. Air duct leakage.

2. The system resistance is large and locally blocked.

3. The conveyor belt slips or breaks.

4. The speed of the motor is reduced.

5. The electric blade is loose with the shaft.

6. The direction of rotation is wrong (newly installed fan).

Elimination method: 1. Plug the air leakage.

2. Clear the blockage.

3. Replace the conveyor belt.

4. Check the power supply voltage or other reasons of the motor.

5. Check the cause of loosening and deal with it.

6. Check and adjust the direction of rotation.

Cold storage failure (2).

Fault Symptom: The impeller is damaged or deformed.

Cause of failure: 1. Loose blade fixing bolts or rivets, corrosion and falling off.

2. The bearing is worn, the scenery shaft is biased, the impeller and the shell are seriously rubbed (touching the shell) 3. Hard debris such as stones fall into the impeller and damage the blade.

Exclusion method: 1. Clean the bearing and add lubricating grease.

2. Repair the deformed blades and replace the bearings.

3. Clean up debris and repair deformed blades.

Cold storage failure (3).

Fault phenomenon: the bearing is overheated or stuck.

Cause of failure: 1. Lack of lubricating grease in the bearing.

2. The working life of the roller bearing has expired.

3. The bearing is not well installed or the fan shaft is not concentrified with the motor, and the bearing is eccentric.

4. The bearing scraping and installation clearance are too small.

Exclusion method: 1. Clean the bearing and add lubricating grease.

2. Update new bearings.

3. Adjust the shaft concentricity of the motor and fan.

4. Re-grind the bearing and adjust the gap between the shaft and the bearing.

Cold storage failure (4).

Fault phenomenon: irregular vibration of the fan.

Cause of failure: 1. The two axes are not concentric.

2. The installation of the two wheels of the fan motor is not parallel or the motor is displaced, and the fixing bolt is loose.

3. The pulley or groove is worn, loose, and the pulley is loose.

4. The balance of the fan impeller is not good.

5. The portability of the casing is not good.

Exclusion method: 1. Adjust the concentricity compound requirements.

2. Readjust and fix the position of the motor.

3. Repair the keyway and replace the worn keys.

4. Check the balance of the impeller.

5. Strengthen the shell.

The pump is faulty (the pump stops working, and the other display is normal).

Reason: 1. The overload protector on the AC contactor of the water pump operates.

2. The pump capacitor is burned out (single-phase).

3. Problems of the pump itself, such as: coil burnout, bearing necrosis, etc.

Exclusion method: 1. Gently press the reset button in the overcurrent protector.

2. Replace the capacitor.

3. Replace the water pump (pay attention to the steering of the water pump when replacing the water pump).

1. Causes and treatment of inverted phase alarm of chiller.

1.If the phase sequence of the mains power supply is incorrect, any two phases of the mains power supply should be shut down and adjusted;

2.When the main power supply is poorly connected or there is a phase gap, it should be reconnected to solve the phase loss problem;

3.If the inverted separator fails and the chiller is inverted alarm, it should be replaced with a new inverter;

Overload protector action on the AC contactor of the water pump. Cause Exclusion method 1, the current controller on the DC contactor of the water pump operates. Gently press the reset switch in the current controller 2. The high-voltage capacitor of the water pump is burned out (single-phase electricity) and the high-voltage capacitor is replaced.

Hello, Kedley chiller manufacturer can regularly maintain the compressor from the following three aspects, regularly check whether the operation is normal, regularly check the sensitivity of the sensor, and change the refrigeration oil regularly

Refrigeration system: observe whether there are cracks, damages, frost and condensation in each pipeline of the refrigeration system; Whether there is any collision and friction between the refrigeration pipelines, pipelines and shells, especially the welding of refrigerant pipelines, whether there is leakage at the joint connection, and there will be oil stains at all leaks (there is a certain amount of refrigeration oil in the refrigeration system), you can also use a clean soft cloth and soft paper to wipe the connection between the pipeline welding and the joint, and observe whether there is oil stain to judge whether there is leakage.

Electrical system: Observe whether the fuse of the electrical system is blown, whether the insulation of the electrical wire is intact and undamaged, whether the circuit board is broken, whether the connection is loose, etc. In particular, whether the electrical connection is in good contact, the wiring screws and plug-in parts are easy to loosen and cause poor contact.

Wind system: Observe the air filter, heat exchanger coil and fin for excessive dust accumulation; whether the air inlet and outlet are unblocked; whether the fan and fan blades are operating normally; Whether the wind is normal, whether the water system is normal, etc.

Water system: Observe whether the water system is leaking; whether the water inlet and outlet are unblocked; Whether the pump is operating properly. Listen:

Turn on the power and listen carefully to whether the compressor of the chiller is running normally, whether there is abnormal sound, whether there is noise in the operation of the fan and water pump, and whether the noise is too loud. During the operation of the chiller, the vibration is slight and the noise is small under normal circumstances.

Touching the relevant parts of the air conditioner with your hands to feel its cold, heat, vibration, etc., is helpful to judge the nature and location of the fault. Normally, the temperature of the condenser is gradually decreasing from top to bottom, and the temperature in the lower part is slightly higher than the ambient temperature. If the whole condenser is not hot or the upper part is slightly warm, or although it is hot, there is a significant difference in the temperature of the upper and lower adjacent pipes, it is abnormal.

Under normal circumstances, if you put your finger dipped in water on the surface of the evaporator, it will feel cold and sticky. Under normal circumstances, the capillary at the dryer and outlet should have a warm feeling (slightly higher than the ambient temperature, which is basically the same as the temperature of the pipe at the end of the condenser), and if it feels lower than the ambient temperature or there is dew condensation on the surface and the temperature difference between the capillaries and each section of the capillary, it is abnormal. The suction pipe at 200mm away from the compressor should be about the same temperature as the ambient temperature under normal circumstances.

In order to accurately judge the nature and location of the fault, it is often necessary to check and measure the performance parameters and status of the chiller with instruments and meters. For example, use a leak detector to check whether there is a refrigerant leak; Use a multimeter to measure whether the power supply voltage, the current to the ground at each terminal and the operating current meet the requirements, and the air conditioner controlled by the computer should also measure whether the potential of each control point is normal.

end precautions.

Most of the results obtained by the above inspection methods can only reflect a certain local state. The various parts of the air conditioner are related to each other and affect each other, and a failure phenomenon may have multiple reasons, and a cause may also produce a variety of failures. Therefore, it is necessary to conduct a comprehensive comparative analysis of local factors, so as to comprehensively and accurately determine the nature and location of the fault.

Refrigeration system failure: excessive frost formation on the evaporator coil; The setting value of the high and low voltage controller is incorrect; There is not enough refrigerant in the system.

How to solve the fault of the refrigeration unit reasonably:

Refrigeration compressor starts frequently: The compressor in operation is controlled by high and low pressure relays, but most of the high voltage relays must be manually reset to restart the compressor after jumping, therefore, the frequent start and stop of the compressor is generally not caused by the high voltage relay but mainly the low pressure relay.

Compressor running time is too long: The root cause of compressor running time is that the unit is not running enough cooling capacity or the cold room is overloaded.

The compressor cannot be loaded or unloaded normally: For the energy regulation system with oil pressure control, the main reason is: the oil pressure is too low. (generally caused by excessive bearing clearance and excessive pump clearance), it can be solved by tightening the hydraulic control valve.

sh Cheng Miao (shchengmiao).